Sahil Takiar created IMPALA-9734:
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Summary: ACID-query retry integration
Key: IMPALA-9734
URL: https://issues.apache.org/jira/browse/IMPALA-9734
Project: IMPALA
Issue Type: Sub-task
Reporter: Sahil Takiar
We need to consider how query retries interact with ACID transactions. As of
IMPALA-9199, Impala will create new ClientRequestStates for each query retry
and will cache the TExecRequest between ClientRequestStates. This might not be
safe for ACID transactions. If the first query attempt fails, then the
transaction will fail and a new one will be required. However, the query retry
will use the transaction id / info from the original query attempt.
I think the semantics are not entirely clear here, and we don't have any tests
for this. So the goal of this JIRA is to (1) identify if there are any issues
with the current approach, (2) fix any issues with transactions during query
retries, and (3) add some query retry tests that enable transactions.
We might want to consider whether a query and it's retry should be in the same,
or different transactions. Keeping them in the same transaction should allow us
cache the TExecRequest. If they are in separate transactions, then Impala might
need to create a new TExecRequest for each retry.
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